Re: [netmod] 6021 ipv4-prefix

"Rob Wilton (rwilton)" <rwilton@cisco.com> Mon, 29 April 2019 14:02 UTC

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From: "Rob Wilton (rwilton)" <rwilton@cisco.com>
To: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
CC: "Acee Lindem (acee)" <acee@cisco.com>, "netmod@ietf.org" <netmod@ietf.org>
Thread-Topic: [netmod] 6021 ipv4-prefix
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Date: Mon, 29 Apr 2019 14:02:31 +0000
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Subject: Re: [netmod] 6021 ipv4-prefix
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> -----Original Message-----
> From: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
> Sent: 29 April 2019 14:46
> To: Rob Wilton (rwilton) <rwilton@cisco.com>
> Cc: Acee Lindem (acee) <acee@cisco.com>om>; netmod@ietf.org
> Subject: Re: [netmod] 6021 ipv4-prefix
> 
> On Mon, Apr 29, 2019 at 01:33:22PM +0000, Rob Wilton (rwilton) wrote:
> >
> > But I'm not convinced that allowing ipv4-prefix values in the non-canonical
> format is necessarily the right thing to do.  If we were defining these as a new
> type today then would we make the same choice of typedef definition?
> >
> >
> > Or is a significant part of your proposal/reasoning to ensure backwards
> compatibility with what we have today?
> >
> 
> I am trying to clarify what the existing definition says since there apparently
> have been different interpretations.

Given the definition of ipv6-prefix already contains:

      " The IPv6 address should have all bits that do not belong
       to the prefix set to zero."

I think that a better solution might be to add the equivalent text to the ipv4-prefix definition:

      " The IPv4 address should have all bits that do not belong
       to the prefix set to zero."

Thanks,
Rob


> 
> /js
> 
> --
> Juergen Schoenwaelder           Jacobs University Bremen gGmbH
> Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
> Fax:   +49 421 200 3103         <https://www.jacobs-university.de/>